Stanford researchers find that the “need” for study breaks has less to do with our biology and more to do with our beliefs. "If you think of willpower as something that's biologically limited, you're more likely to be tired when you perform a difficult task," said Veronika Job, the paper's lead author. "But if you think of willpower as something that is not easily depleted, you can go on and on." Of course if the mind just is the brain, then the distinction between biologically needing a break and believing that you need one becomes a false distinction. Isn't it?